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Www.projectmesa.org & Page 1 Train Crash Scenario - a draft spectrum assessment example - MESA User needs and scenarios drive spectrum requirements by.

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Presentation on theme: "Www.projectmesa.org & Page 1 Train Crash Scenario - a draft spectrum assessment example - MESA User needs and scenarios drive spectrum requirements by."— Presentation transcript:

1 & Page 1 Train Crash Scenario - a draft spectrum assessment example - MESA User needs and scenarios drive spectrum requirements by Steffen Ring Chairman Project MESA Steering Committee

2 & Page 2 The Scenario as it developed Broadband Communication needs Spectrum Assessment Conclusion

3 & Page 3 Scenario A massive train accident in one of the largest cities in the world. A high-speed passenger train and a freight train pulling numerous tank cars of propane and hydrochloric acid have been switched onto adjacent tracks. The center track closed for rail replacements. The scene is set for disaster. And it gets worse...

4 & Page 4 The situation A new sports stadium build upon land reclaimed from a cleaned-up waste site parallels the three sets of railroad tracks that are in daily use for commuter, freight and high-speed passenger operations. It is late Saturday afternoon. A steady 20 MPH wind is blowing right into the stadium from the direction of the tracks people is watching the football game. Parking lots are full. A concert and fireworks show is scheduled for later.....

5 & Page 5 The Event The northbound passenger train approaching the stadium on the inside track. 10 cars, 400 passengers, dual-tandem engines. Speed 100 Km/h. The southbound freight train is rolling through with 4 cars of hydrochloric acid and 8 cars of propane. Total 121 cars pulled by 5 engines in tandem, speed Km/h. Behind the stadium the freight train is unexpectedly switched to the center track.... The entire event unfolds in less than a minute: First engine reaches the point where the track has been removed. Five diesel locomotives leave the track pulling 16 cars with them. Acid leaking out producing a deadly fog blowing into the stadium. Propane cars remain upright. Engineer of the passenger train is helpless. Engine and 5 passenger cars leave the track. Impact is deadly..... Football game stopped. Panic breaks out on the entire stadium cell phones try to call for help at the same time

6 & Page 6 Mobile Ad-Hoc Network The Moving Hot-Spot Master Node Backhaul Link Full scene: Command Control Communication UPLINK

7 & Page 7 Broadband spectrum assessment Example2:Train Disaster BASIC BROADBAND SCENARIO PARAMETERS Hot-spot area: 1 Km 2 No of Paramedical EMS staff: 120 –40 ambulances shuttelling No of HazMat Staff: 18 Firefighters: 25 –5 Trucks Rescue Squad Members: 50 –5 Robots deployed for wreckage inspection Law Enforcement Officers: 35 1 cell: Circular, r = 500 m No of MESA Robots: 5 –Streaming Video Visible Light (MPEG4) –Control Carrier Crash Area Air Surveillance by video Ground Transport Logistics Road access and route assistance

8 & Page 8 Some relevant applications 1) No of active Streaming Video units: 45 (+ 5 Robots with Cameras) 2) EMS Still Picture sequencing units: 50 units 3) Fingerprint Scanning: 20 Units 4) IP Voice Streaming The M.1390 Methodology calls for separate calculations of spectrum requirements, Uplink and Downlink, application by application. In typical hot-spot communications the upink (information sent FROM the hot-spot)will be the most busy. In this draft example we shall therefore only consider the uplink requirements, and for clarity only calculate 1) and 2)

9 & Page 9 Broadband Communication Applications - typical data speeds to accomodate - Online Video streaming (MPEG4 700 kBPS Stills from scene (Patients) 250 kBytes) Online IP Voice streaming Fingerprint Scanning remote matching –500 dpi (AFIS Standard from Police/Law Enforcement) –8 bit dynamic range (256 Gray-scale resolution) –Image 1 x 1 Inch : File size 2 Mbit uncompressed From Fingerprint To Mugshot

10 & Page 10 Emergency and Medical Services (EMS) Remote Patient Monitoring Frontline Medical Assistance by Broadband Wireless Networking: Video and Image Sequencing Electro Encephalographic data (EEG) Electro Cardiograph (ECG) Blood Pressure Temperature Bit-rates saves lives

11 & Page 11 Mobile Robotics Automated inspection of non-accessible areas Rescue of people from hazardous areas Anti terrorist actions Incident response both tactical and non-tactical Urban warfare Haz-Mat Handling Airborne control

12 & Page 12 The basic equations Rec. ITU-R M.1390 F terrestrial - the weighted summation of co-existing individual spectrum components F es [MHz] –Here we consider F es as the sole component required to host the PPDR Broadband requirements as outlined in these examples F Terrestrial = α es β Σ F es F es = T es S es [MHz], Where T es [Mbit/s/cell] is theTraffic pr Cell, and S es [Mbit/s/MHz/cell] is the net system cell capacity

13 & Page 13 Geographic Considerations Uplink calculation Streaming Video 1) Selection of e – environmental type: Combination of Density and Mobility e Dense Urban 2) Cell geometry: Circular, r = 500 m, Cell_Area e = 1 Km 2 3) Service type s = High Multimedia, Packet Switched Net_User_Bit_Rate s = 1000 kbit/s (MPEG4 kbit/s) + overhead. 4) Population Density, All Units Operating: Pop_Density e = 50 [Km -2 ]

14 & Page 14 Geographic and Market Considerations Uplink calculation Streaming Video 5) Penetration Rate, is 100 % as all potential users are active, so Penetr_rate = 100 % or = 1 6) Users per cell Users/Cell es = Pop_Density * Penetr_rate = 50

15 & Page 15 Traffic Considerations Uplink calculation Streaming Video 7) Busy_Hour_Call_Attempts s = 1, For Packet Switched systems defined as number of sessions 8) Call_Duration = 3600 [s] or 1 [E] 9) Activity_Factor = 100% The precentage of time the frequency resource is used 10) Traffic/User es = Busy_Hour_Call_Attempts s * Call_Duration * Activity_Factor = 3600 [call-seconds] 11) Offered_Traffic/Cell = Traffic/User es * Users/Cell = 36*10 3

16 & Page 16 Technical and System Considerations Streaming Video Uplink final assessment 12) Service_Channel_Bit_Rate s = Net_User_Bit_Rate s * 1.5 = 1500 kbit/s The scaling factor accounts for RF channel overhead such as crypto coding And error recoverage handling 13) Anticipating 50 service channels per cell we calculate Traffic: T es = Service_Channels/Cell es * Service_Channel_Bit_Rate es = 75 Mbit/s/cell MESA technology has not been selected yet. However if we consider current avaible digital technology such as carriers of Π/4 DQPSK Offering kHz (~1.5 bit/s/Hz) we get: S es = 1.5 Mbit/s/MHz/cell F es = T es S es [MHz], = 75/1.5 [MHz] = 50 MHz uplink

17 & Page 17 Geographic Considerations Uplink calculation EMS Still Images 1) Selection of e – environmental type: Combination of Density and Mobility e Dense Urban 2) Cell geometry: Circular, r = 500 m, Cell_Area e = 1 Km 2 3) Service type s = High Multimedia, Packet Switched Net_User_Bit_Rate s = 250 * 8/5 = 400 kbit/s (1 * 250 kB JPEG image every 5 seconds) 4) Population Density, All Units Operating: Pop_Density e = 50 [Km -2 ]

18 & Page 18 Geographic and Market Considerations Uplink calculation Still Images 5) Penetration Rate, is 100 % as all potential users are active, so Penetr_rate = 100 % or = 1 6) Users per cell Users/Cell es = Pop_Density * Penetr_rate = 50

19 & Page 19 Traffic Considerations Uplink calculation Still Images 7) Busy_Hour_Call_Attempts s = 1 For Packet Switched systems defined as number of sessions 8) Call_Duration = 3600 [s] or 1 [E] 9) Activity_Factor = 100% The precentage of time the frequency resource is used 10) Traffic/User es = Busy_Hour_Call_Attempts s * Call_Duration * Activity_Factor = 3600 [call-seconds] 11) Offered_Traffic/Cell = Traffic/User es * Users/Cell = 180*10 3 [call-seconds]/Cell

20 & Page 20 Technical and System Considerations Uplink Calculation Still Images final assessment 12) Service_Channel_Bit_Rate s = Net_User_Bit_Rate s * 1.5 = 600 kbit/s The scaling factor accounts for RF channel overhead such as crypto coding And error recoverage handling 13) Anticipating 50 service channels per cell we calculate Traffic: T es = Service_Channels/Cell es * Service_Channel_Bit_Rate es = 30 Mbit/s/cell MESA technology has not been selected yet. However if we consider current avaible digital technology such as carriers of Π/4 DQPSK Offering kHz (~1.5 bit/s/Hz) we get: S es = 1.5 Mbit/s/MHz/cell F es = T es S es [MHz], = 30/1.5 [MHz] = 20 MHz uplink

21 & Page 21 Packet Switched Multimedia Environment Well known Collission Detection principle applied (such as CDMA/CD) Well known digital wireless technology applied such as a π/4DQPSK modulated carrier offering 1.5 bits/s/Hz No degradation in Quality of Service due to spectum congestion tolerated Ad-hoc high speed interlinking of rescue units not considered part of the applications requirements for available spectrum Conclusion Based on the assumptions below, the Rescue Team and the EMS crew assistance at the scene, some 70 MHz of uplink spectrum wil be needed for their Broad Band needs during this incident


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